Painting with the Region Tools

You use the Region tools to label pixels within regular and irregular shaped regions on 2D views in Single slice mode and in 3D views.

Region tools

 

 Icon Description

Rectangle

You use the Rectangle tool to draw rectangular-shaped areas.

  • Drag to shape and size the required region.

.Ellipse

You use the Ellipse tool to draw circular or oval-shaped areas.

  • Drag to shape and size the required region.

Polygon

You use the Polygon tool to draw polygonal areas.

  • Click on a succession of points to define the contour of the region.

Freehand

You use the Freehand tool to draw free-form areas.

  • Drag to define the required contour.
  1. Select the required 2D or 3D view.
  2. If you are working on a 2D view, select Single slice mode (see ROI Painter Tool Settings).
  3. If you are working in the 3D view, select a working area in the drop-down menu (see ROI Painter Tool Settings).

    Note If you are working on the image data, adjust the window leveling so that only the voxels you want to label are visible (see Window Leveling). If you are working on the region of interest, then you will only be able to remove voxels from the selected region of interest.

  4. Select the required region tool — Rectangle, Ellipse, Polygon, or Freehand.
  5. Do the following:
    • Hold down Left Ctrl (or your configured Add with key) and then draw the required region. Pixels within the drawn area will be added to the selected region of interest when the Add with key is released.
    • Hold down Left Shift (or your configured Remove with key) and then draw the required region. Pixels within the drawn area will be removed from the selected region of interest when the Remove with key is released.

    Note Refer to Configured Actions for the Region Tools for additional information about the configured actions for the Region tools.